Online Tool Store
Loan Calculator
Calculate monthly loan payments, total interest, and a full amortization schedule — with extra-payment savings and CSV export, free in your browser.
This works right here on your device — nothing gets sent out.
How the loan calculator works
- Enter the amount borrowed, annual interest rate, and repayment term.
- Optionally add a recurring extra monthly payment and/or a one-time lump sum at a specific payment number.
- The calculator applies the standard fixed-payment amortization formula, including support for zero-interest loans, and applies any extra payments to principal each month.
- Review the estimated monthly payment, borrowing cost, interest and time saved from extra payments, and the full payment-by-payment schedule — downloadable as CSV.
This estimate assumes a fixed interest rate and equal monthly payments. It does not include fees, taxes, insurance, or lender-specific rounding.
FAQ
Do extra payments actually reduce my interest?
Yes. Every extra dollar you add reduces the remaining balance immediately, so less interest accrues on it going forward — the calculator recalculates the full schedule to show exactly how much interest and time you save.
Can I add both a recurring extra payment and a one-time payment?
Yes. Open "Extra payments (optional)" to set a recurring extra monthly amount, a one-time lump sum, and which payment number the lump sum applies to — both can be used together.
Is this calculation exact or an estimate?
It is a standard fixed-rate amortization estimate. It does not include fees, taxes, insurance, or a lender’s specific rounding rules, so your actual statement may differ slightly.
Does this tool store or upload my loan details?
No. Every calculation runs in your browser. Nothing you enter is sent to a server or saved anywhere.
Can I download the payment schedule?
Yes. Expand "View amortization schedule" and select Download CSV to save the full payment-by-payment table for a spreadsheet.
What happens with a 0% interest rate?
The calculator switches to simple equal installments (loan amount ÷ number of payments), since the standard amortization formula is undefined at exactly 0% interest.
How we compare
| Feature | Online Tool Store | calculator.net | TheCalculatorSite |
|---|---|---|---|
| Extra monthly and one-time payments | Yes | Yes | Yes |
| Multiple currencies | 7 currencies | USD only | Multi-currency |
| Downloadable CSV schedule | Yes | Print only | Not offered |
For a fast, private loan estimate that shows exactly how much extra payments save in interest and time, with a downloadable schedule, Loan Calculator covers the common case without extra clutter.